US6833859B1 - Method of locating radio frequency leaks in a CATV system - Google Patents
Method of locating radio frequency leaks in a CATV system Download PDFInfo
- Publication number
- US6833859B1 US6833859B1 US09/491,592 US49159200A US6833859B1 US 6833859 B1 US6833859 B1 US 6833859B1 US 49159200 A US49159200 A US 49159200A US 6833859 B1 US6833859 B1 US 6833859B1
- Authority
- US
- United States
- Prior art keywords
- signal
- leak
- leakage
- leakage signal
- distance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/0252—Radio frequency fingerprinting
- G01S5/02521—Radio frequency fingerprinting using a radio-map
- G01S5/02524—Creating or updating the radio-map
- G01S5/02525—Gathering the radio frequency fingerprints
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- General Health & Medical Sciences (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Electromagnetism (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
Description
Claims (43)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/491,592 US6833859B1 (en) | 1999-02-01 | 2000-01-25 | Method of locating radio frequency leaks in a CATV system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11810799P | 1999-02-01 | 1999-02-01 | |
US09/491,592 US6833859B1 (en) | 1999-02-01 | 2000-01-25 | Method of locating radio frequency leaks in a CATV system |
Publications (1)
Publication Number | Publication Date |
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US6833859B1 true US6833859B1 (en) | 2004-12-21 |
Family
ID=33513517
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/491,592 Expired - Fee Related US6833859B1 (en) | 1999-02-01 | 2000-01-25 | Method of locating radio frequency leaks in a CATV system |
Country Status (1)
Country | Link |
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US (1) | US6833859B1 (en) |
Cited By (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040210938A1 (en) * | 2003-04-16 | 2004-10-21 | Cable Leakage Technologies, Inc. | Method and system for automatically analyzing and modifying cable television signal leak information |
US20050185593A1 (en) * | 2004-02-20 | 2005-08-25 | Realtek Semiconductor Corp. | Transmission medium testing apparatus and method |
US20060235737A1 (en) * | 2005-04-15 | 2006-10-19 | Karen Fleurant | Quality control of authoring work flow within a benefits content system |
US20070022457A1 (en) * | 2005-07-20 | 2007-01-25 | Cable Leakage Technologies, Inc. | Method and system for analyzing cable television signal leak information |
US20080033698A1 (en) * | 2006-08-07 | 2008-02-07 | Trilithic, Inc. | Leakage location methods |
US20080167808A1 (en) * | 2007-01-05 | 2008-07-10 | Harris James E | Method for Displaying Leakage Location and Leakage Magnitude |
US20090096665A1 (en) * | 2007-10-10 | 2009-04-16 | Acterna Llc | Method For Locating Cable Impairments |
US20090300534A1 (en) * | 2008-05-30 | 2009-12-03 | Trilithic, Inc. | Apparatus and method for displaying network status |
WO2011022197A1 (en) | 2009-08-18 | 2011-02-24 | Arcom Digital, Llc | Method and apparatus for detecting and locating leakage of digital signals |
US20110085456A1 (en) * | 2009-10-14 | 2011-04-14 | Zimmerman Dennis A | Signal Egress Alarm |
US8532488B2 (en) | 2011-07-01 | 2013-09-10 | Certusview Technologies, Llc | Cable communication systems and methods employing QAM upstream channels below 16.4 MHz for increased aggregate deployed upstream capacity to support voice and/or data services |
US8650605B2 (en) | 2012-04-26 | 2014-02-11 | Arcom Digital, Llc | Low-cost leakage detector for a digital HFC network |
WO2014062649A2 (en) * | 2012-10-15 | 2014-04-24 | Trilithic, Inc. | Icon-based home certification, in-home leakage testing, and antenna matching pad |
US8752108B2 (en) | 2010-07-21 | 2014-06-10 | Magella Bouchard | System and method for detecting signal ingress interferences |
US8949918B2 (en) | 2013-03-15 | 2015-02-03 | Certusview Technologies, Llc | Hybrid fiber-coaxial (HFC) cable communication systems having well-aligned optical and radio-frequency links to facilitate upstream channel plans having high aggregate data capacity |
US9021539B2 (en) | 2006-08-07 | 2015-04-28 | Trilithic, Inc. | Leakage location methods |
US9160407B2 (en) | 2011-06-27 | 2015-10-13 | Trilithic, Inc. | Method for detecting leakage in digitally modulated systems |
US20160036492A1 (en) * | 2014-07-29 | 2016-02-04 | Cable Television Laboratories, Inc. | Radio frequency leakage detection in a cable plant |
US9491027B2 (en) | 2011-04-06 | 2016-11-08 | Comsonics, Inc. | Miniature mobile marker system and method |
US9729257B2 (en) | 2014-09-24 | 2017-08-08 | Cable Television Laboratories, Inc. | Isolating an upstream noise source in a cable television network |
US9882663B2 (en) | 2016-03-17 | 2018-01-30 | Arcom Digital, Llc | Doppler location of signal leaks in an HFC network |
US9924390B2 (en) | 2011-04-06 | 2018-03-20 | Comsonics, Inc. | Shielding flaw detection and measurement in quadrature amplitude modulated cable telecommunications environment |
US20190107460A1 (en) * | 2017-10-06 | 2019-04-11 | Wistron Neweb Corporation | Conduit leakage detection system and method |
US10707917B2 (en) | 2017-11-08 | 2020-07-07 | Viavi Solutions, Inc. | Instrument, system, and method for locating a leakage source |
US11719735B1 (en) * | 2017-10-09 | 2023-08-08 | Cable Television Laboratories, Inc. | Systems and methods for break detection |
CN116660826A (en) * | 2023-05-17 | 2023-08-29 | 中天射频电缆有限公司 | Leakage device, positioning method and electronic equipment |
Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3828306A (en) * | 1973-01-08 | 1974-08-06 | P Angeloni | Highway distress system |
US4072899A (en) * | 1976-04-26 | 1978-02-07 | Comsonics, Inc. | RF leak detector |
US4810961A (en) * | 1986-11-19 | 1989-03-07 | Shimizu Construction Co., Ltd. | Radio wave leakage diagnosing system for intelligent building |
US5140307A (en) * | 1989-12-25 | 1992-08-18 | Omega Electronics S.A. | Arrangement for timing moving objects |
US5294937A (en) * | 1992-05-20 | 1994-03-15 | Cable Leakage Technologies | Cable leakage monitoring system |
US5557282A (en) * | 1988-10-11 | 1996-09-17 | Itt Corporation | Height finding antenna apparatus and method of operation |
US5777662A (en) * | 1996-08-27 | 1998-07-07 | Comsonics, Inc. | Ingress/egress management system |
US6005518A (en) * | 1997-12-31 | 1999-12-21 | Kallina; Henry D. | Coaxial cable RF leakage detector |
US6009334A (en) * | 1997-11-26 | 1999-12-28 | Telefonaktiebolaget L M Ericsson | Method and system for determining position of mobile radio terminals |
US6018358A (en) * | 1994-06-09 | 2000-01-25 | Trilithic, Inc. | Radio frequency leakage detection system for CATV system |
US6272350B1 (en) * | 1997-12-04 | 2001-08-07 | Lucent Technologies Inc. | Method for improved line of sight signal detection using time/frequency analysis |
US6307593B1 (en) * | 1997-10-03 | 2001-10-23 | Wavetek Corporation | Pulsed leakage tagging signal |
US6310646B1 (en) * | 1996-11-29 | 2001-10-30 | Wavetek Corporation | Method and apparatus for measuring a radio frequency signal having program information and control information |
US6313874B1 (en) * | 1997-11-17 | 2001-11-06 | Wavetek Corporation | Method and apparatus for direct detection of communication system leakage signals |
-
2000
- 2000-01-25 US US09/491,592 patent/US6833859B1/en not_active Expired - Fee Related
Patent Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3828306A (en) * | 1973-01-08 | 1974-08-06 | P Angeloni | Highway distress system |
US4072899A (en) * | 1976-04-26 | 1978-02-07 | Comsonics, Inc. | RF leak detector |
US4810961A (en) * | 1986-11-19 | 1989-03-07 | Shimizu Construction Co., Ltd. | Radio wave leakage diagnosing system for intelligent building |
US5557282A (en) * | 1988-10-11 | 1996-09-17 | Itt Corporation | Height finding antenna apparatus and method of operation |
US5140307A (en) * | 1989-12-25 | 1992-08-18 | Omega Electronics S.A. | Arrangement for timing moving objects |
US5294937A (en) * | 1992-05-20 | 1994-03-15 | Cable Leakage Technologies | Cable leakage monitoring system |
US6018358A (en) * | 1994-06-09 | 2000-01-25 | Trilithic, Inc. | Radio frequency leakage detection system for CATV system |
US5777662A (en) * | 1996-08-27 | 1998-07-07 | Comsonics, Inc. | Ingress/egress management system |
US6310646B1 (en) * | 1996-11-29 | 2001-10-30 | Wavetek Corporation | Method and apparatus for measuring a radio frequency signal having program information and control information |
US6307593B1 (en) * | 1997-10-03 | 2001-10-23 | Wavetek Corporation | Pulsed leakage tagging signal |
US6313874B1 (en) * | 1997-11-17 | 2001-11-06 | Wavetek Corporation | Method and apparatus for direct detection of communication system leakage signals |
US6009334A (en) * | 1997-11-26 | 1999-12-28 | Telefonaktiebolaget L M Ericsson | Method and system for determining position of mobile radio terminals |
US6272350B1 (en) * | 1997-12-04 | 2001-08-07 | Lucent Technologies Inc. | Method for improved line of sight signal detection using time/frequency analysis |
US6005518A (en) * | 1997-12-31 | 1999-12-21 | Kallina; Henry D. | Coaxial cable RF leakage detector |
Cited By (65)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7548201B2 (en) | 2003-04-16 | 2009-06-16 | Cable Leakage Technologies, Inc. | Method and system for automatically analyzing and modifying cable television signal leak information |
US20040210938A1 (en) * | 2003-04-16 | 2004-10-21 | Cable Leakage Technologies, Inc. | Method and system for automatically analyzing and modifying cable television signal leak information |
US20050185593A1 (en) * | 2004-02-20 | 2005-08-25 | Realtek Semiconductor Corp. | Transmission medium testing apparatus and method |
US7979219B2 (en) | 2004-02-20 | 2011-07-12 | Realtek Semiconductor Corp. | Transmission medium testing apparatus and method |
US20090259422A1 (en) * | 2004-02-20 | 2009-10-15 | Kuang-Yu Yen | Transmission Medium Testing Apparatus and Method |
US7561980B2 (en) * | 2004-02-20 | 2009-07-14 | Realtek Semiconductor Corp. | Transmission medium testing apparatus and method |
US20060235737A1 (en) * | 2005-04-15 | 2006-10-19 | Karen Fleurant | Quality control of authoring work flow within a benefits content system |
US7945939B2 (en) * | 2005-07-20 | 2011-05-17 | Cable Leakage Technologies, Inc. | Method and system for analyzing cable television signal leak information |
US20070022457A1 (en) * | 2005-07-20 | 2007-01-25 | Cable Leakage Technologies, Inc. | Method and system for analyzing cable television signal leak information |
US20110145873A1 (en) * | 2005-07-20 | 2011-06-16 | Cable Leakage Technologies, Inc. | Method and System for Analyzing Cable Television Signal Leak Information |
US20080033698A1 (en) * | 2006-08-07 | 2008-02-07 | Trilithic, Inc. | Leakage location methods |
US9021539B2 (en) | 2006-08-07 | 2015-04-28 | Trilithic, Inc. | Leakage location methods |
US20080167808A1 (en) * | 2007-01-05 | 2008-07-10 | Harris James E | Method for Displaying Leakage Location and Leakage Magnitude |
US20090096665A1 (en) * | 2007-10-10 | 2009-04-16 | Acterna Llc | Method For Locating Cable Impairments |
US8154303B2 (en) * | 2007-10-10 | 2012-04-10 | Ben Maxson | Method for locating cable impairments |
US20090300534A1 (en) * | 2008-05-30 | 2009-12-03 | Trilithic, Inc. | Apparatus and method for displaying network status |
WO2011022197A1 (en) | 2009-08-18 | 2011-02-24 | Arcom Digital, Llc | Method and apparatus for detecting and locating leakage of digital signals |
US8904460B2 (en) | 2009-08-18 | 2014-12-02 | Arcom Digital, Llc | Methods and apparatus for locating leakage of digital signals |
US8456530B2 (en) | 2009-08-18 | 2013-06-04 | Arcom Digital, Llc | Methods and apparatus for detecting and locating leakage of digital signals |
US20110043640A1 (en) * | 2009-08-18 | 2011-02-24 | Arcom Digital, Llc | Methods and apparatus for detecting and locating leakage of digital signals |
US9709621B2 (en) | 2009-08-18 | 2017-07-18 | Arcom Digital, Llc | Leakage detection of digital signals in an HFC network |
US9038119B2 (en) | 2009-08-18 | 2015-05-19 | Arcom Digital, Llc | Low-cost leakage detector for a digital HFC network |
US20110085456A1 (en) * | 2009-10-14 | 2011-04-14 | Zimmerman Dennis A | Signal Egress Alarm |
US8752108B2 (en) | 2010-07-21 | 2014-06-10 | Magella Bouchard | System and method for detecting signal ingress interferences |
US9491027B2 (en) | 2011-04-06 | 2016-11-08 | Comsonics, Inc. | Miniature mobile marker system and method |
US9924390B2 (en) | 2011-04-06 | 2018-03-20 | Comsonics, Inc. | Shielding flaw detection and measurement in quadrature amplitude modulated cable telecommunications environment |
US9160407B2 (en) | 2011-06-27 | 2015-10-13 | Trilithic, Inc. | Method for detecting leakage in digitally modulated systems |
US9877050B2 (en) | 2011-06-27 | 2018-01-23 | Trilithic, Inc. | Apparatus for detecting leakage in digitally modulated systems |
US10334291B2 (en) | 2011-06-27 | 2019-06-25 | Viavi Solutions, Inc. | Apparatus for detecting leakage in digitally modulated systems |
US8977132B2 (en) | 2011-07-01 | 2015-03-10 | Certusview Technologies, Llc | Ingress-mitigated RF cable plants and ingress mitigation methods for same |
US8543003B2 (en) | 2011-07-01 | 2013-09-24 | Certusview Technologies, Llc | Ingress-mitigated cable communication systems and methods having increased upstream capacity for supporting voice and/or data services |
US8948596B2 (en) | 2011-07-01 | 2015-02-03 | CetusView Technologies, LLC | Neighborhood node mapping methods and apparatus for ingress mitigation in cable communication systems |
US8811191B2 (en) | 2011-07-01 | 2014-08-19 | Certusview Technologies, Llc | Iterative mapping methods for ingress mitigation in cable communication systems |
US9019855B2 (en) | 2011-07-01 | 2015-04-28 | Certusview Technologies, Llc | Cable communication systems and methods employing TDMA/ATDMA QAM upstream channels below 20 MHz for increased upstream capacity to support voice and/or data services |
US8806559B2 (en) | 2011-07-01 | 2014-08-12 | Certusview Technologies, Llc | Methods for ingress mitigation in cable communication systems involving repair, replacement and/or adjustment of infrastructure elements |
US8532488B2 (en) | 2011-07-01 | 2013-09-10 | Certusview Technologies, Llc | Cable communication systems and methods employing QAM upstream channels below 16.4 MHz for increased aggregate deployed upstream capacity to support voice and/or data services |
US9088310B2 (en) | 2011-07-01 | 2015-07-21 | Certusview Technologies, Llc | Cable communication systems and methods employing QAM upstream channels below 16.4 MHz for increased aggregate deployed upstream capacity |
US8578437B2 (en) | 2011-07-01 | 2013-11-05 | Certusview Technologies, Llc | Methods for ingress mitigation in cable communication systems involving repair, replacement and/or adjustment of infrastructure elements |
US9577746B2 (en) | 2011-07-01 | 2017-02-21 | Certusview Technologies, Llc | Methods for ingress remediation in cable communication systems |
US8650606B2 (en) | 2011-07-01 | 2014-02-11 | Certusview Technologies, Llc | Cable communication systems and methods employing 256-QAM upstream channels and having increased upstream capacity for supporting voice and/or data services |
US8650605B2 (en) | 2012-04-26 | 2014-02-11 | Arcom Digital, Llc | Low-cost leakage detector for a digital HFC network |
WO2014062649A2 (en) * | 2012-10-15 | 2014-04-24 | Trilithic, Inc. | Icon-based home certification, in-home leakage testing, and antenna matching pad |
US9667956B2 (en) | 2012-10-15 | 2017-05-30 | Trilithic, Inc. | Icon-based home certification, in-home leakage testing, and antenna matching pad |
US20220217327A1 (en) * | 2012-10-15 | 2022-07-07 | Viavi Solutions Inc. | Icon-based home certification, in-home leakage testing, and antenna matching pad |
US11856182B2 (en) * | 2012-10-15 | 2023-12-26 | Viavi Solutions Inc. | Icon-based home certification, in-home leakage testing, and antenna matching pad |
US11212517B2 (en) * | 2012-10-15 | 2021-12-28 | Viavi Solutions Inc. | Icon-based home certification, in-home leakage testing, and antenna matching pad |
US10728539B2 (en) | 2012-10-15 | 2020-07-28 | Viavi Solutions, Inc. | Icon-based home certification, in-home leakage testing, and antenna matching pad |
US10110888B2 (en) | 2012-10-15 | 2018-10-23 | Viavi Solutions, Inc. | Icon-based home certification, in-home leakage testing, and antenna matching pad |
US10116930B2 (en) * | 2012-10-15 | 2018-10-30 | Viavi Solutions, Inc. | Icon-based home certification, in-home leakage testing, and antenna matching pad |
US10771777B2 (en) * | 2012-10-15 | 2020-09-08 | Viavi Solutions, Inc. | Icon-based home certification, in-home leakage testing, and antenna matching pad |
WO2014062649A3 (en) * | 2012-10-15 | 2014-07-17 | Trilithic, Inc. | Icon-based home certification, in-home leakage testing, and antenna matching pad |
US20190313089A1 (en) * | 2012-10-15 | 2019-10-10 | Viavi Solutions, Inc. | Icon-based home certification, in-home leakage testing, and antenna matching pad |
US9660729B2 (en) | 2013-03-15 | 2017-05-23 | Certusview Technologies, Llc | Cable communication system optical nodes having selectable attenuation values to mitigate distortion of upstream information |
US8949918B2 (en) | 2013-03-15 | 2015-02-03 | Certusview Technologies, Llc | Hybrid fiber-coaxial (HFC) cable communication systems having well-aligned optical and radio-frequency links to facilitate upstream channel plans having high aggregate data capacity |
US20160036492A1 (en) * | 2014-07-29 | 2016-02-04 | Cable Television Laboratories, Inc. | Radio frequency leakage detection in a cable plant |
US9455766B2 (en) * | 2014-07-29 | 2016-09-27 | Cable Television Laboratories, Inc | Radio frequency leakage detection in a cable plant |
US9729257B2 (en) | 2014-09-24 | 2017-08-08 | Cable Television Laboratories, Inc. | Isolating an upstream noise source in a cable television network |
US9882663B2 (en) | 2016-03-17 | 2018-01-30 | Arcom Digital, Llc | Doppler location of signal leaks in an HFC network |
US20190107460A1 (en) * | 2017-10-06 | 2019-04-11 | Wistron Neweb Corporation | Conduit leakage detection system and method |
US10788392B2 (en) * | 2017-10-06 | 2020-09-29 | Wistron Neweb Corporation | Conduit leakage detection system and method |
US11719735B1 (en) * | 2017-10-09 | 2023-08-08 | Cable Television Laboratories, Inc. | Systems and methods for break detection |
US10707917B2 (en) | 2017-11-08 | 2020-07-07 | Viavi Solutions, Inc. | Instrument, system, and method for locating a leakage source |
US11456773B2 (en) | 2017-11-08 | 2022-09-27 | Viavi Solutions Inc. | Instrument, system, and method for locating a leakage source |
CN116660826A (en) * | 2023-05-17 | 2023-08-29 | 中天射频电缆有限公司 | Leakage device, positioning method and electronic equipment |
CN116660826B (en) * | 2023-05-17 | 2023-12-19 | 中天射频电缆有限公司 | Leakage device, positioning method and electronic equipment |
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